Automation System
A disadvantage of Numerical Control (NC) is:

None of these
the computer is not reliable
the tape and tape reader are not reliable
the machine tool can easily overheat
one operator is needed for each machine.

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Automation System
Time proportioning control:

None of these
cannot use a TM990 micro¬computer
a and b above.
is less efficient than normal PID control
can be used on a PM550 programmable process controller

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Automation System
What is proportional control?

None of these
All of these
It has a discrete output for each error value
The controller output varies continuously over a range
The gain is independent of offset error.

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Automation System
In raster-scan colour monitors, colour can be intensified by:

grouping the phosphor dots in a circular pattern
using an in-line gun arrangement with a solid metal mesh
having each electron gun controlled by a composite signal
having each electron gun controlled by separate signal
None of these

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